Tegan Jovanka was an Australianair stewardess trainee who wandered into the Fourth Doctor's TARDIS seeking help when she mistook it for a genuine police box. She quickly became embroiled in the events surrounding the Doctor's regeneration and found herself a somewhat unwilling passenger of the Fifth Doctor, as he failed to successfully return her to her proper time and place. Tegan was one of the few companions to have parted company with the Doctor and then return for a significant number of adventures.

Tegan's relatively long tenure of service onboard the TARDIS belied an ambivalence about travel with the Doctor. Even through her final glimpse of the TARDIS, she vacillated between wanting to stay and wanting to go.

She went to high school with Mike Bretherton, who lived next door to her in Brisbane. They were taught physics and chemistry by Miss Anderson. When she was fifteen in 1975, she broke her toe during track and gym and Mike carried her books home for her. (AUDIO: Hexagora)

Her mother was still alive in 2006. On 22 September of that year, she telephoned her daughter to wish her a happy forty-sixth birthday. She wanted to pay Tegan a visit so they could celebrate together, but Tegan claimed she was too busy with work to fit her mother into her plans. She told her she was going to have a few drinks with her friends from work instead. (AUDIO: The Gathering)

The TARDIS crew discovered they had an accidental passenger in the form of Tegan. However, returning her to her rightful time and place was a secondary concern for the time being. The Doctor grew aware the Master was trying to create instability in the universe by manipulating Logopolis. Tegan became embroiled in the Doctor's cause once she learned the Master had killed her aunt using his Tissue Compression Eliminator. Standing on a crumbling Logopolis with the Doctor, she became one of the few companions to travel in the Master's TARDIS. The trio journeyed to Earth's Pharos Project to stop the rampant entropy the Master had unleashed upon the universe when he disrupted the calculations of the mathematicians of Logopolis, causing the CVEs to disappear. Once there, she witnessed the Doctor's fall from the Project's radio telescope and his consequent regeneration. (TV: Logopolis)

Tegan did not abandon the Doctor, even though she was ostensibly in her proper time and place. Perhaps seeing she would face a charge for criminal trespass, she threw her lot in with Nyssa, Adric and the newly regenerated Doctor. She and Nyssa were critical to stabilising the Doctor's difficult regeneration. She became a temporary TARDIS pilot (albeit receiving unknowing help from the Master) and saved it from being destroyed when it tried to travel past the Event One horizon. Her success was tempered by the Master's manipulation of the outcomes. (TV: Castrovalva)

On the planetDeva Loka, Tegan accidentally fell asleep at "the place of shared dreams",

allowing the Mara to take over her body after torturing her with nightmares. She was freed from the Mara when it possessed Aris, a mute Kinda male. While the Mara was being destroyed by forcing it to look at its reflection, Tegan looked at the Mara, apparently allowing a small portion of it to escape deep into her subconscious. (TV: Kinda)

During a trip to the 26th century, on Earth, the Doctor took a walk with his companions in a series of caves to ease his stress after an argument with Adric about the lack of attention and respect he got compared to Nyssa or Tegan, causing tension between the Doctor and Adric. They were found by soldiers, led by Lieutenant Scott, who accused Tegan, along with the rest of the group, of killing the rest of the archaeologists on Professor Kyle's team that had been searching the caves for fossils. It turned out that the Doctor and his companions were falsely accused and that the real killers were androids controlled by the Cybermen when several of the soldiers were killed by the androids. The Doctor ordered Tegan and Nyssa to get everyone back to the TARDIS when he discovered that one of the androids carried a powerful bomb. The Doctor traced a signal sent to androids from a freighter spaceship waiting for clearance outside the Solar System, revealing it was inadvertently transporting Cybermen who plotted to destroy most life on Earth in order to kill several dignitaries visiting for an interstellar alliance conference, which they had planned to do with the androids, before the Doctor foiled them by deactivating the bomb. Tegan attempted to help set up a barricade on the bridge of the freighter to prevent the Cyberman from taking over, but a double agent on the security team sabotaged their defences, resulting in Tegan's capture, forcing the Doctor to help the Cybermen escape to safety in the TARDIS when their back up plan was revealed to be to send the freighter on a collision course to Earth, leaving everyone else to die on the doomed ship. During this encounter Adric lost his life when the ship crashed into Earth while he was trying to finish disarming the Cybermen's control device on the ship's navigation out of scholarly pride. His efforts had already caused the ship to jump in time to the point when a large object had crashed into the Earth causing the extinction of the dinosaurs, successfully subverting the Cybermen's plans, and everyone else had been able to escape when Adric had disabled the warp, but he himself refused to escape until the device was come tell disabled. Adric was stopped from disabling the last lock on the device when a damaged Cyberman destroyed the console he was working on, making it impossible for Adric to finish. The Doctor, Nyssa, and Tegan could only watch as Adric died, the Doctor unable to pilot the TARDIS back to the bridge to save Adric due to the console sustaining damage in the fight with the Cybermen, the defeat of whom being possible because of Adric's gold Badge for Mathematic Excellence, which was given to Doctor by Adric after finding out that the Cybermen were susceptible to gold. Tegan was furious at the Doctor's refusal to go back in time and rescue Adric. (TV: Earthshock)

Arriving at Heathrow Airport in contemporary times after the events of (TV: Earthshock), Tegan and the Doctor and Nyssa were still mourning the recent loss of Adric, Tegan taking it especially hard. The Doctor was enlisted, after he name-dropped UNIT to clear up the trouble caused when the materializations of the TARDIS disrupted flight patterns, to find several flights and their passengers that have gone missing traveling from London to Heathrow. It was revealed that the passengers were taken by the Master to 140 million years in the past and tricked by an illusion of their intended destination to use them as slave labour in order to break into a Citadel so that he can use a power source found at the centre, revealed to be in fact a gestalt intelligence of a great number of members of the Xeraphin species suffering from split-personality disorder, to power his damaged TARDIS. Fleeing the crossfire of two warring species, the Xeraphin had crashed on Earth where the radiation from their ship forced them to take ethereal form within the gestalt, and the Citadel built to protect them until the radiation waned, but the Master's presence caused them to become unstable and develop their split-personality. Nyssa and Tegan had teamed up in order to get into the Citadel when the Doctor was taken by the Master. Once the Master was defeated and all the passengers and crew of the missing flights safe and accounted for, the Doctor and Nyssa dematerialized in the TARDIS without Tegan, sadly leaving her behind at Heathrow Airport in her home time. This is due to the misunderstanding that the Doctor and Nyssa believed Tegan was finally where and when she wanted to be. Tegan ran out of the airport too late to catch them and was upset at being left behind. (TV: Time-Flight)

Tegan's time as an air stewardess was ultimately short-lived as she was sacked within her first year after assaulting an unruly passenger mid-flight. It was during this time that she caught the attention of Kylex-12, an android who had been wandering the earth for 300 years in hopes of finding means of time travel for his mistress, Teldek. Introducing himself to Tegan as Kyle, his scanners were able to tell that she was a time traveller and decided that following her would be his best chance of discovering her means of time travel. Over the next two months, Kyle found himself falling in love with Tegan as the two of them began dating each other, using his mind scanner to accommodate her needs and desires. Eventually, however, Tegan grew tired of Kyle's over-attentive ways and broke up with him right as he was preparing to propose to her. (AUDIO: The Waters of Amsterdam)

Tegan went to Amsterdam in January1983 on a trip to visit her cousin, Colin Frazer, only to find that he had disappeared. She ended up captured by Omega, a rogue Time Lord whom the Doctor had previously defeated during his third incarnation. Omega had kidnapped her cousin to use as bait to lure her there. Tegan was used as leverage by Omega to have the Doctor stay alive so his genetic template could be used to create a new body for Omega out of positive matter. Once the process was done and began to fail, Tegan reunited with the Doctor and watched him seemingly destroy Omega before he could revert to anti-matter and destroy Earth. (TV: Arc of Infinity)

After Omega's defeat, Tegan discovered that Kyle had followed her to Amsterdam in an attempt to win her affections once more. After Tegan rebuffed him again, Kyle directed her and the Doctor to a Rembrandt exhibit at the art museum showcasing his drawings of spaceships. While at the museum, the Nix—beings of pure water who sought to punish Teldek for the destruction of her homeworld—pursued Kyle as well as the Doctor and his companions in an attempt to stop Kyle from traveling back to his mistress in the 17th century. Ultimately, they were unsuccessful as Kyle travelled with the Doctor and his companions back to the 17th century to investigate the anachronistic Rembrandt drawings. During their adventure, Kyle eventually revealed his true identity and intentions to Tegan, but conceded that he was really in love with her all along. Although his feelings for Tegan were unreciprocated, he ultimately turned on Teldek, helping the Doctor thwart her plans to mould humanity into a technologically advanced race by the late 20th century so that she could use their space fleet to take revenge on the Nix. In the end, Kyle accepted that Tegan did not love him back and decided to continue his existence in hope of finding someone who could love him in return. (AUDIO: The Waters of Amsterdam)

On Manussa, the remnants of the Mara which had possessed her gave Tegan prophetic dreams about the cave whence the jewel drew power. Despite the Doctor's efforts to help her suppress the monster, Tegan submitted to its will again and helped it feed on the negative emotions of those at a ceremony recalling the creature's first defeat. The Doctor performed the "snakedance" and found the "still point" within himself, destroying the Mara for good, for he had no negative emotions for it to feed on. Tegan was permanently freed from its possession. (TV: Snakedance)

Back on Earth, Tegan met two different versions of the retiredAlistair Gordon Lethbridge-Stewart. He was teaching at a public school whose student population included the mysterious Turlough. She displayed a talent for character assessment when she immediately warmed to the former, while distrusting the latter. When she mistook Mawdryn for the Doctor, going through a bad regeneration, Tegan ended up infected with his virus, which caused her to age backwards when the real Doctor tried to remove her from Mawdryn's spaceship in the TARDIS. Tegan was saved when the two versions of the Brigadier met, releasing enough energy to power Mawdryn's machine, cure her and Nyssa, and allow Mawdryn and his fellow mutants to die. Turlough joined the TARDIS crew, something Tegan was not pleased about. (TV: Mawdryn Undead)

Thanks to Turlough's sabotaging of the TARDIS, Tegan and the others ended up on a spaceship filled with victims suffering from Lazar's disease. While the Doctor sought out the controls to prevent the ship from causing another Big Bang that would end the universe, she and Turlough were sent to find Nyssa, who had been infected and taken away for treatment. Nyssa's decision to stay on Terminus to care for the victims of Lazar's disease affected Tegan emotionally. (TV: Terminus)

Tegan dealt with the unwanted attentions of the EternalMarriner (PROSE: Enlightenment), a being who didn't love her so much as want to live vicariously through her emotions. During the same adventure, she saw Turlough turn from evil and reject the Black Guardian. This caused her to warm up to Turlough, if just a little. (TV: Enlightenment)

Two days later Tegan, Turlough and the Doctor arrived on Helheim where they were reunited with Nyssa but it had been fifty years for her. Tegan discovered that Nyssa had cured Lazar's disease. After the Doctor failed to take Nyssa home she joined them again on the TARDIS. (AUDIO: Cobwebs)

The Doctor, Tegan, Turlough and Nyssa then arrived on Cherdor in the 28th century, where they found a society which was obsessed with cleanliness, and lived under the menace of the Takers. After discovering the truth behind the origins to the corrupt society, the TARDIS crew returned to the TARDIS, but discovered that Tegan was still possessed by the Mara. (AUDIO: The Whispering Forest)

The Doctor took Tegan and Turlough to the Eye of Orion to relax. However, she soon was pulled into helping the Doctor and his first three selves complete the Game of Rassilon, as part of a plan by the corrupt Lord President Borusa. Here, Tegan again met the Brigadier, along with Susan Foreman and Sarah Jane Smith. After the Doctor was made Lord President in Borusa's place, Tegan was surprised the Doctor wanted to run from the Time Lords. (TV: The Five Doctors)

When her life was being novelised by a colleague of Huxley, the noveliser's prose style reminded her of her Aunt Vanessa. (AUDIO: Ringpullworld)

After receiving damage from Sentinel Six, the Doctor landed the TARDIS inside Sea Base 4 in the year 2084, at a time where two power blocs were on the brink of nuclear war. When the Doctor and Tegan were trapped in an airlock with the Myrka, Turlough forced Nilson to open the bulkhead door and ensure their safety. Tegan was taken hostage by the enemy human agent Nilson, but the Doctor blinded him with an ultraviolet converter, saving Tegan. When the Doctor released hexachromite gas into the base to stop the Silurians and Sea Devils from attacking, he asked Tegan and Turlough to give the Silurians oxygen. The Doctor stopped the Silurians from starting a nuclear war between the two human power blocs, but was unable to save any of the humans or reptilian life forms inside the base. (TV: Warriors of the Deep)

Eventually, the carnage of the early phase of the Dalek civil war proved too much for Tegan to bear. She bid an emotional and accusatory farewell to the Doctor and Turlough in London in 1984 and ran off before the Doctor could respond. Even so, she ran back to see the TARDIS dematerialise, calling out her goodbyes. (TV: Resurrection of the Daleks)

After leaving the TARDIS for the second time, Tegan apparently continued working as an air stewardess for some time before returning to Brisbane to take over her father's animal-feed company. (AUDIO: The Gathering)

On 22 September2006, Tegan was briefly reunited with the Fifth Doctor, who discovered that she had been diagnosed with an incurable brain tumour and had at most a year to live. Despite the Doctor's entreaty, Tegan chose to forgo his assistance in treating the tumour. She stated that she wished to remain on Earth, because she was happy with the life that she had. She rekindled her relationship with Michael Tanaka. She had previously ended the relationship because of her tumour. (AUDIO: The Gathering)

Tegan was stubborn, loud and direct, once describing herself as "just a mouth on legs." (TV: Earthshock) While she often bickered with her fellow travellers, her intrinsic honesty and morality proved useful. The Doctor once noted that these qualities made her a good coordinator. (TV: Castrovalva) She was also more likely to detect a threat to the Doctor's safety than her fellow companions. (TV: Castrovalva, Mawdryn Undead)

Of her fellow travellers, she was likely closest to Nyssa, whose controlled nature was in many ways the precise opposite of her own. (TV: Castrovalva) She was indignant at the Doctor's apparent unwillingness to save Adric's life (TV: Earthshock) and genuinely saddened when Nyssa left. (TV: Terminus)

On Deva Loka, Tegan argued with Adric after he suggested she was too weak-minded to defy the Mara and that the ensuing chaos was her fault. (TV: Kinda) However, she also showed concern for Adric's well-being when he was captured and tortured by the Master, (TV: Castrovalva) and grieved for him after his death. (TV: Time-Flight)

The Doctor often encouraged her to find her inner strength with the words, "Brave heart, Tegan", which he saw her saying as he regenerated. (TV: The Caves of Androzani) Although she told him that she found it annoying and asked him never to say it again, he did so on numerous subsequent occasions. (AUDIO: Psychodrome) Tegan herself muttered those word to herself after leaving the TARDIS and watching it dematerialise. (TV: Resurrection of the Daleks)

Tegan claimed that the Doctor often gave her "half pained, half patronising" looks and later described him as the most annoying man that she had ever met. (AUDIO: Aquitaine) On one occasion, she derisively referred to the Doctor as a "posho". (AUDIO: The Peterloo Massacre)

Adric once described Tegan as being "unreasonably highly strung". (AUDIO: The Toy)

The Doctor once compared Tegan and Turlough to bickering siblings. (AUDIO: Freakshow) On another occasion, Turlough jokingly told Tegan that "stubbornness is one of Australia's greatest exports." (AUDIO: The Emerald Tiger)

Two days after she met Adric, Tegan told Nyssa that he "rubbed [her] up the wrong way" and accused him of being condescending and "a male chauvinist." Shortly afterwards, she described the Doctor as an "incompetent lunatic who talks gibberish." (AUDIO: Psychodrome)

The reference to Tegan still being alive in 2010 is not necessarily a contradiction of her terminal condition in The Gathering as there are many real-life accounts of people surviving with tumours for much longer than predicted, and given her connection to the Doctor there's also the possibility an as-yet-unchronicled event changed her circumstances after The Gathering. Also, the Doctor told System to help Tegan, and System did at some point go into production, as it was active in 2021 at St. Gart's Brookside Hospital in The Harvest.